That's to fit a ten year old rather than the age of the oversuit.

Worth checking here before I visit Sparrowland to see what they have.

Bought my kids' (now 10 and 13 - just the right gap to cascade gear down) at Bernies. Very pleased with it. Not yet ready to sell the 10 year old's kit as he'll fit it for another 6 to 12 months I'm afraid!

Get them proper furries, oversuits and wetsox and they get so much more out of caving, cos they're comfy.